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International Journal of Engineering and Advanced Research Technology

Volume 3 Issue 4 (April 2017)

S.No. Title & Authors Page No View

Title : Comb Filter Implementation using Voltage Differencing Transconductance Amplifier

Authors : Vipul Jee Verma, Vipul Dhasmana, Shubham Marathia, Saurabh Kaura

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Abstract :

This paper presents an implementation of active comb filter using Voltage differencing transconductance amplifier (VDTA). Comb filter is used to remove the signals of selected frequencies. The proposed realization of VDTA is resistorless and possesses electronic tunability. PSPICE simulation through 180nm CMOS technology parameter is carried out to verify the functionality of proposed comb filter.


Title : Research on time-delay vibration damping control of three degrees half-vehicle suspension system in idle condition

Authors : Qingchang Wang, Chuanbo Ren, Lei Zhang

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Abstract :

A 3DOF(three-degree of freedom) half-vehicle suspension model with time-delay feedback control is established to study vehicle vibration performance in idle condition. When running in idle condition, the vehicles don’t have speeds and road excitation, so engine vertical self-vibration is the only excitation source. Utilizing Routh-Hurwitz criterion and a new frequency scanning method to analyze the stability of the suspension system. Introduced by the damping mechanism of time-delay dynamic vibration absorber and the system amplitude frequency characteristic, establishing the unified-object function based on the body displacement and pitch movement. By using Matlab Optimization Toolbox, designed the best time-delay feedback coefficient and time-delay value of suspension system, and the simulation is conducted in both time and frequency domain. Simulation results show the RMS(root-mean square) of vehicle body displacement and pitching motion with time-delay feedback control is respectively reduced 65.1% and 61.1% under the engine simple harmonic excitation. In conclusion, the vibration control with time-delay can effectively improve engine vibration isolation and vehicle working performance in idle condition, which provides a theoretical basis and reference for simulation analysis and optimal design of the vehicle vibration system in idle condition.